Observation of three P states in the radiative decay of Upsilon (2S).

R Nernst,J K Bienlein,D Antreasyan,B Monteleoni,F C Porter,M Schmitz,J Schotanus,R W Kraemer,M Scheer,W J Metzger,P Lezoch,Z Jakubowski,W Walk,B Renger,I Kirkbride,R T Van De Walle,F H Heimlich,C Rippich,R Lekebusch,U Volland,D Sievers,B Lurz,P G Pelfer,P Zschorsch,W Koch,F Messing,H Wegener,K Wacker,D Gelphman,R Cabenda,G Folger,K Königsmann,D Besset,S Leffler,K Strauch,W Maschmann,J Gaiser,A Engler,P Schmitt,J Irion,U Strohbusch,A Fridman,G Conforto,D Aschman,A C König,R Cowan,S Keh,Tetsuo Matsui ,R Lee ,S Cooper ,G Nowak ,D Prindle ,B Pollock ,A S Schwarz ,M Cavalli‐Sforza ,H G Kilian ,D Williams ,R Hofstadter ,D Marlow ,R Clare ,C A Edwards ,G Godfrey ,C Peck ,A Cartacci ,D.g Coyne ,T Skwarnicki ,Dario De Judicibus ,H J Trost ,P N Ratoff ,I C Brock ,E D Bloom ,W S Lockman ,S Lowe ,T Kloiber ,J Tompkins ,C Newman-Holmes ,A M Litke ,B Niczyporuk

doi:10.1103/physrevlett.54.2195

Observation of three P states in the radiative decay of Upsilon (2S).

R Nernst, J K Bienlein + Show 76 more

https://doi.org/10.1103/physrevlett.54.2195

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Journal: Physical Review Letters	Publication Date: May 20, 1985
Citations: 28

Affiliation: California Institute of Technology, Deutsches Elektronen-Synchrotron DESY, SLAC National Accelerator Laboratory, Universität Hamburg

#Inclusive Photon Spectrum #Crystal Ball Detector + Show 8 more

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Abstract

The inclusive photon spectrum in hadronic decays of the UPSILON(2S) is measured with the Crystal Ball detector at DORIS II. Four well separated photon lines, which are consistent with the decay hypothesis UPSILON(2S)..--> gamma..+ /sup 3/P/sub 2,1,0/ and /sup 3/P/sub 2,1/..--> gamma..+UPSILON(1S), are observed. The energies of the lines from the primary transitions are E/sub gamma1/ = 110.4 +- 0.8 +- 2.2 MeV, E/sub gamma2/ = 130.6 +- 0.8 +- 2.4 MeV and E/sub gamma3/ = 163.8 +- 1.6 +- 2.7 MeV; the branching fractions are (5.8 +- 0.7 +- 1.0)%, (6.5 +- 0.7 +- 1.2)%, and (3.6 +- 0.8 +- 0.9)%, respectively. The secondary transitions center at approx. =430 MeV with a combined branching fraction of (3.6 +- 0.7 +- 0.5)%.

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